Should i join the basketball team?

yeah im thinkin of joining the bball team for my school... i never played for a team and the reasons why were because im not that great and i get nervous around big crowds and im afraid ill mess up some easy stuff in a game like a lay up or get blocked alot since im short... what can i do! i wanna over come this fear... another thing holding me back is if i keep messing up drills and plays in practice makin my teammates mad at me... help me please.